Allied Telesis AT-S39 - Manual (Page 45)

AT-S39 User’s Guide
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4. Type S to select Save Configuration Changes.
Note
If you activate the BOOTP and DHCP client software, the switch
immediately begins to query the network for a BOOTP or DHCP
server. The switch continues to query the network for its IP
configuration until it receives a response.
Any static IP address, subnet mask, and gateway address assigned to
the switch are deleted from the Administration menu and replaced
with the values the switch receives from the BOOTP or DHCP server.
If you later disable BOOTP and DHCP, these values are returned to
their default setting of 0.0.0.0.